ios - 如何检查两个可选的 UITextFields

Question

我有 2 个 UITextFields:一个是 VehiclePlateNumber，另一个是 TrailerPlateNumber。它们都是可选的。但是，如果它们都丢失了，那么当我单击 NEXT 按钮时，我将显示一条消息。问题是我无法在只有 1 个 UITextField 填满的情况下进入下一个屏幕。目前我需要把它们都填满才能进入下一个屏幕，我不想这样。这是我的代码:

class RegistrationNumber {

    var vehicleRegistrationNumber: String?
    var trailerRegistrationNumber: String?

    init(vehicleRegistrationNumber: String?, trailerRegistrationNumber: String?) {
        self.vehicleRegistrationNumber = vehicleRegistrationNumber
        self.trailerRegistrationNumber = trailerRegistrationNumber
    }
}

// I was thinking to use this enum somehow. Or maybe is possible with guardlets ?
enum isValid {
        case vehicle
        case trailer
        case vehicleAndTrailer
    }

// When user press Next button
    @IBAction func nextBtnTapped(_ sender: UIBarButtonItem) {

        let selectInspection = storyboard?.instantiateViewController(withIdentifier: "SelectInspectionVC") as! SelectInspectionVC

        selectInspection.receivedRegistrationNumber = RegistrationNumber(vehicleRegistrationNumber: vehicleRegTextField.text, trailerRegistrationNumber: trailerRegTextField.text)

        let spinner = UIViewController.displaySpinner(onView: self.view)

        if notContainsVehicleReg(){
            showAlertWithTitle(message: "Wrong vehicle registration.")
            UIViewController.removeSpinner(spinner: spinner)
            print("Vehicle don't exist in list !!!")
        }
        else if notContainsTrailerReg(){
            showAlertWithTitle(message: "Wrong trailer registration.")
            UIViewController.removeSpinner(spinner: spinner)
            print("Trailer don't exist in list !!!")
        }
        else if vehicleRegTextField.text.isBlank && trailerRegTextField.text.isBlank{
            showAlertWithTitle(message: "Vehicle registration or/and Trailer Code required.")
            UIViewController.removeSpinner(spinner: spinner)
        }
        else{
            UIViewController.removeSpinner(spinner: spinner)
            navigationController?.pushViewController(selectInspection, animated: true)
        }
    }

fileprivate func notContainsVehicleReg() -> Bool {

        let filteredVehicles: [String] = vehiclesArray.map { $0.code.uppercased() }

        return !filteredVehicles.contains(vehicleRegTextField.text ?? String())
    }

    fileprivate func notContainsTrailerReg() -> Bool {

        let filteredTrailers: [String] = trailersArray.map { $0.code.uppercased() }

        return !filteredTrailers.contains(trailerRegTextField.text ?? String())
    }

// Extension to check if an optional String is empty or contain blank spaces
extension Optional where Wrapped == String {
    var isBlank: Bool {
        if let unwrapped = self {
            return unwrapped.isBlank
        } else {
            return true
        }
    }
}

// Check if a textfield don't contain white spaces or is empty
extension String {
    var isBlank: Bool {
        return self.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    }
}

如果你想帮助我，谢谢。

Answer 1

只需将您的 nextBtnTapped(:UIBarButton) 函数更改为此即可。这将检查两个 textFields 是否为空，如果其中一个或两个都正确填充，它将转到下一个 ViewController。

        @IBAction func nextBtnTapped(_ sender: UIBarButtonItem) {

            let spinner = UIViewController.displaySpinner(onView: self.view)

            if vehicleRegTextField.text.isBlank && trailerRegTextField.text.isBlank{
                showAlertWithTitle(message: "Vehicle registration or/and Trailer Code required.")
                UIViewController.removeSpinner(spinner: spinner)
            } else {
                let selectInspection = storyboard?.instantiateViewController(withIdentifier: "SelectInspectionVC") as! SelectInspectionVC

                selectInspection.receivedRegistrationNumber = RegistrationNumber(vehicleRegistrationNumber: vehicleRegTextField.text, trailerRegistrationNumber: trailerRegTextField.text)
                UIViewController.removeSpinner(spinner: spinner)
                navigationController?.pushViewController(selectInspection, animated: true)
            }
        }